Ch 14

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Work

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The product of force and distance.

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Joule

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The SI unit of work.

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20 Terms

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Work

The product of force and distance.

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Joule

The SI unit of work.

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Power

The rate of doing work.

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Watt

The SI unit of power.

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Horse Power

Equivalent to 746 watts.

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Machine

A device that changes a force.

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Input Force

The force you exert on a machine.

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Work Input

The work done by the input force acting through the input distance.

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Output Force

The force exerted by the machine through the output distance.

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Work Output

The output force manipulated by the output distance.

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Mechanical Advantage

The number of times that the machine increases an input force.

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Actual Mechanical Advantage

The ratio of the output force to the input force.

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Ideal Mechanical Advantage

Mechanical advantage in the absence of friction.

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Efficiency

Percentage of the work input that becomes an output.

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Lever

A rigid bar that is free to move around at a fixed point.

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Fulcrum

The fixed point the lever rotates around.

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Input Arm

The distance between the input force and the fulcrum.

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Output Arm

The distance between the output force and the fulcrum.

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Wheel and Axle

A simple machine that consists of two disks or cylinders, each with a different radius.

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Inclined Plane

A slanted surface along which an object moves to different elevations.